/Engine/Plugins/Experimental/SlateScreenReader/Source/SlateScreenReader/Public/SlateScreenReaderEngineSubsystem.h
Returns true if text to speech for a screen reader user is muted. Otherwise false is returned. If the provided user Id doesn't exist, false will be returned.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="SlateScreenReader") bool IsSpeechMuted ( UPARAM(DisplayName="Screen Reader User Id") int32 InUserId ) const